/**
 * U-009: Live Cursor — Concurrent Update Handling
 */

import { describe, it, expect, beforeAll, afterAll } from 'vitest'
import { prisma } from '../setup'
import {
  createTestUser,
  createTestProgram,
  createTestPipeline,
  createTestTrack,
  createTestStage,
  createTestProject,
  createTestPSS,
  createTestCohort,
  createTestCohortProject,
  cleanupTestData,
} from '../helpers'
import {
  startSession,
  setActiveProject,
  jumpToProject,
  pauseResume,
  openCohortWindow,
  closeCohortWindow,
} from '@/server/services/live-control'

let programId: string
let userIds: string[] = []

beforeAll(async () => {
  const program = await createTestProgram({ name: 'Live Control Test' })
  programId = program.id
})

afterAll(async () => {
  await cleanupTestData(programId, userIds)
})

describe('U-009: Live Cursor Operations', () => {
  it('starts a session for a LIVE_FINAL stage', async () => {
    const admin = await createTestUser('SUPER_ADMIN')
    userIds.push(admin.id)

    const pipeline = await createTestPipeline(programId)
    const track = await createTestTrack(pipeline.id)
    const stage = await createTestStage(track.id, {
      name: 'Live Final',
      stageType: 'LIVE_FINAL',
      status: 'STAGE_ACTIVE',
    })

    // Create cohort with projects
    const project1 = await createTestProject(programId, { title: 'Live Project 1' })
    const project2 = await createTestProject(programId, { title: 'Live Project 2' })
    const cohort = await createTestCohort(stage.id, { name: 'Final Cohort' })
    await createTestCohortProject(cohort.id, project1.id, 0)
    await createTestCohortProject(cohort.id, project2.id, 1)

    const result = await startSession(stage.id, admin.id, prisma)

    expect(result.success).toBe(true)
    expect(result.sessionId).not.toBeNull()
    expect(result.cursorId).not.toBeNull()

    // Verify cursor state
    const cursor = await prisma.liveProgressCursor.findUnique({
      where: { stageId: stage.id },
    })
    expect(cursor).not.toBeNull()
    expect(cursor!.activeProjectId).toBe(project1.id) // First project
    expect(cursor!.activeOrderIndex).toBe(0)
    expect(cursor!.isPaused).toBe(false)
  })

  it('rejects starting a session on non-LIVE_FINAL stage', async () => {
    const admin = await createTestUser('SUPER_ADMIN')
    userIds.push(admin.id)

    const pipeline = await createTestPipeline(programId)
    const track = await createTestTrack(pipeline.id)
    const stage = await createTestStage(track.id, {
      name: 'Evaluation Stage',
      stageType: 'EVALUATION',
      status: 'STAGE_ACTIVE',
    })

    const result = await startSession(stage.id, admin.id, prisma)

    expect(result.success).toBe(false)
    expect(result.errors!.some(e => e.includes('LIVE_FINAL'))).toBe(true)
  })

  it('handles concurrent cursor updates without corruption', async () => {
    const admin = await createTestUser('SUPER_ADMIN')
    userIds.push(admin.id)

    const pipeline = await createTestPipeline(programId)
    const track = await createTestTrack(pipeline.id)
    const stage = await createTestStage(track.id, {
      name: 'Concurrent Test',
      stageType: 'LIVE_FINAL',
      status: 'STAGE_ACTIVE',
    })

    const project1 = await createTestProject(programId, { title: 'ConcP1' })
    const project2 = await createTestProject(programId, { title: 'ConcP2' })
    const project3 = await createTestProject(programId, { title: 'ConcP3' })
    const cohort = await createTestCohort(stage.id, { name: 'Conc Cohort' })
    await createTestCohortProject(cohort.id, project1.id, 0)
    await createTestCohortProject(cohort.id, project2.id, 1)
    await createTestCohortProject(cohort.id, project3.id, 2)

    // Start session
    await startSession(stage.id, admin.id, prisma)

    // Fire 2 concurrent setActiveProject calls
    const [result1, result2] = await Promise.all([
      setActiveProject(stage.id, project2.id, admin.id, prisma),
      setActiveProject(stage.id, project3.id, admin.id, prisma),
    ])

    // Both should succeed (last-write-wins)
    expect(result1.success).toBe(true)
    expect(result2.success).toBe(true)

    // Final cursor state should be consistent (one of the two writes wins)
    const cursor = await prisma.liveProgressCursor.findUnique({
      where: { stageId: stage.id },
    })
    expect(cursor).not.toBeNull()
    // The active project should be either project2 or project3, not corrupted
    expect([project2.id, project3.id]).toContain(cursor!.activeProjectId)
  })

  it('jump, pause/resume, and cohort window operations work correctly', async () => {
    const admin = await createTestUser('SUPER_ADMIN')
    userIds.push(admin.id)

    const pipeline = await createTestPipeline(programId)
    const track = await createTestTrack(pipeline.id)
    const stage = await createTestStage(track.id, {
      name: 'Full Live Test',
      stageType: 'LIVE_FINAL',
      status: 'STAGE_ACTIVE',
    })

    const p1 = await createTestProject(programId, { title: 'P1' })
    const p2 = await createTestProject(programId, { title: 'P2' })
    const cohort = await createTestCohort(stage.id, { name: 'Test Cohort', isOpen: false })
    await createTestCohortProject(cohort.id, p1.id, 0)
    await createTestCohortProject(cohort.id, p2.id, 1)

    await startSession(stage.id, admin.id, prisma)

    // Jump to index 1
    const jumpResult = await jumpToProject(stage.id, 1, admin.id, prisma)
    expect(jumpResult.success).toBe(true)
    expect(jumpResult.projectId).toBe(p2.id)

    // Pause
    const pauseResult = await pauseResume(stage.id, true, admin.id, prisma)
    expect(pauseResult.success).toBe(true)

    const cursorPaused = await prisma.liveProgressCursor.findUnique({ where: { stageId: stage.id } })
    expect(cursorPaused!.isPaused).toBe(true)

    // Resume
    const resumeResult = await pauseResume(stage.id, false, admin.id, prisma)
    expect(resumeResult.success).toBe(true)

    // Open cohort window
    const openResult = await openCohortWindow(cohort.id, admin.id, prisma)
    expect(openResult.success).toBe(true)

    const openCohort = await prisma.cohort.findUnique({ where: { id: cohort.id } })
    expect(openCohort!.isOpen).toBe(true)
    expect(openCohort!.windowOpenAt).not.toBeNull()

    // Close cohort window
    const closeResult = await closeCohortWindow(cohort.id, admin.id, prisma)
    expect(closeResult.success).toBe(true)

    const closedCohort = await prisma.cohort.findUnique({ where: { id: cohort.id } })
    expect(closedCohort!.isOpen).toBe(false)
    expect(closedCohort!.windowCloseAt).not.toBeNull()
  })
})